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diff --git a/kitten/user/hello_world/hello_world.c b/kitten/user/hello_world/hello_world.c
new file mode 100644
index 0000000..7831b50
--- /dev/null
+++ b/kitten/user/hello_world/hello_world.c
@@ -0,0 +1,111 @@
+/* Copyright (c) 2008, Sandia National Laboratories */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <limits.h>
+#include <lwk/liblwk.h>
+
+static void pmem_api_test(void);
+static void aspace_api_test(void);
+
+int
+main(int argc, char *argv[], char *envp[])
+{
+	int i;
+	id_t aspace_id;
+
+	printf("Hello, world!\n");
+
+	printf("Arguments:\n");
+	for (i = 0; i < argc; i++)
+		printf("  argv[%d] = %s\n", i, argv[i]);
+
+	printf("Environment Variables:\n");
+	for (i = 0; envp[i] != NULL; i++)
+		printf("  envp[%d] = %s\n", i, envp[i]);
+
+	pmem_api_test();
+	aspace_api_test();
+
+	printf("Spinning forever...\n");
+	while (1) {}
+}
+
+static void
+pmem_api_test(void)
+{
+	struct pmem_region query, result;
+	unsigned long bytes_umem = 0;
+	int status;
+
+	printf("TEST BEGIN: Physical Memory Management\n");
+
+	query.start = 0;
+	query.end = ULONG_MAX;
+	pmem_region_unset_all(&query);
+
+	printf("  Physical Memory Map:\n");
+	while ((status = pmem_query(&query, &result)) == 0) {
+		printf("    [%#016lx, %#016lx) %-11s\n",
+			result.start,
+			result.end,
+			(result.type_is_set)
+				? pmem_type_to_string(result.type)
+				: "UNSET"
+		);
+
+		if (result.type == PMEM_TYPE_UMEM)
+			bytes_umem += (result.end - result.start);
+
+		query.start = result.end;
+	}
+
+	if (status != -ENOENT) {
+		printf("ERROR: pmem_query() status=%d\n", status);
+	}
+
+	printf("  Total User-Level Managed Memory: %lu bytes\n", bytes_umem);
+
+	printf("TEST END: Physical Memory Management\n");
+}
+
+static void
+aspace_api_test(void)
+{
+	int status;
+	id_t my_id, new_id;
+
+	printf("TEST BEGIN: Address Space Management\n");
+
+	if ((status = aspace_get_myid(&my_id)) != 0)
+		printf("ERROR: aspace_get_myid() status=%d\n", status);
+	else
+		printf("  My address space ID is %u\n", my_id);
+
+	printf("  Creating a new aspace: ");
+
+	status = aspace_create(ANY_ID, "TEST-ASPACE", &new_id);
+	if (status)
+		printf("\nERROR: aspace_create() status=%d\n", status);
+	else
+		printf("id=%u\n", new_id);
+
+	printf("  Using SMARTMAP to map myself into aspace %u\n", new_id);
+	status = aspace_smartmap(my_id, new_id, SMARTMAP_ALIGN, SMARTMAP_ALIGN);
+	if (status) printf("ERROR: aspace_smartmap() status=%d\n", status);
+
+	aspace_dump2console(new_id);
+
+	status = aspace_unsmartmap(my_id, new_id);
+	if (status) printf("ERROR: aspace_unsmartmap() status=%d\n", status);
+
+	printf("  Destroying a aspace %u: ", new_id);
+	status = aspace_destroy(new_id);
+	if (status)
+		printf("ERROR: aspace_destroy() status=%d\n", status);
+	else
+		printf("OK\n");
+
+	printf("TEST END: Address Space Management\n");
+}